Band-like motion and mobility saturation in organic molecular semiconductors

Details Band-like motion and mobility saturation in organic molecular semiconductors Band-like motion and mobility saturation in organic molecular semiconductors

2009-10-22

arxiv.org/abs/0910.4244v2

Phys. Rev. Lett. 103, 266601 (2009)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.103.266601

We analyze a model that accounts for the inherently large thermal lattice fluctuations associated to the weak van der Waals inter-molecular bonding in crystalline organic semiconductors. In these materials the charge mobility generally exhibits a "metallic-like" power-law behavior, with no sign of thermally activated hopping characteristic of carrier self-localization, despite apparent mean-free-paths comparable or lower than the inter-molecular spacing. Our results show that such puzzling transport regime can be understood from the simultaneous presence of band carriers and incoherent states that are dynamically localized by the thermal lattice disorder.

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